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Rejuvenator dose optimization

Rejuvenator dose optimization

Full article describing the rejuvenator dose optimization methodology:
Determining Optimum Rejuvenator Dose for Asphalt Recycling Based on Superpave Performance Grade SpecificationsConstruction and Building Materials


100% Recycled Hot Mix Asphalt: A Review and Analysis, (2014), Resour Conserv Recy 92: 230-245  
Influence of Six Rejuvenators on the Performance Properties of Reclaimed Asphalt Pavement (RAP) binder and 100% recycled asphalt mixtures, (2014), Cons Build Mat 71: 538-550  
Determining optimum rejuvenator dose for Asphalt Recycling Based on Superpave Performance Grade Specifications, (2014), Cons Build Mat 69: 159-166  
Review of very high-content reclaimed asphalt use in plant-produced pavements: state of the art, (2015), Int J  Pavement Eng 16 (1): 39-55  
Evaluation of Different Recycling Agents for Restoring Aged asphalt Binder and Performance of 100% Recycled Asphalt, (2014), Mater Struct  
Rheological, microscopic, and chemical characterization of the rejuvenating effect on asphalt binders, (2014), Fuel 135: 162-171
Evaluation of Rejuvenator's Effectiveness with Conventional Mix Testing for 100% Reclaimed Asphalt Pavement Mixtures, (2013) Transp Res Rec 2370 (1): 17-25  
Finite element modeling of rejuvenator diffusion in RAP binder film – simulation of plant mixing process, RILEM symposium 2013, Stockholm, Sweden, 06.12-14.2013    
Low temperature properties of 100% reclaimed asphalt pavement mixtures, 5th European Asphalt Technology Association, Braunschweig, Germany, 06.03-05.2013       
Use of Rejuvenators for Production of Sustainable High Content RAP Hot Mix Asphalt, 28th International Baltic Road Conference, Vilnius, Lithuania, 08.26-28.2013
Interactive presentation of Phase I results and research plans
Rejuvenator dose has to be optimized to ensure reduced stiffness and improved resistance to cracking without over softening the binder to cause rutting. To develop a procedure for selecting optimum rejuvenator dose the changes in RAP binder performance grade and penetration with the application of two contents of the six previously tested rejuvenators were evaluated. The study showed that for all of the rejuvenators the high and low PG temperature were reduced linearly with an increased dose while the penetration grew exponentially. All rejuvenators at an optimum dose could restore the RAP binder to the performance grade of the source PG 64-22 binder and multiple grades could be formulated by changing the dose. An outline for optimizing the rejuvenator dose was developed to account for the variability of the RAP binder due to differences in aging and source.